General Relativity and Quantum Cosmology
[Submitted on 22 Jun 2015 (v1), last revised 13 Oct 2015 (this version, v2)]
Title:Cusp singularities in f(R) gravity: pros and cons
View PDFAbstract:We investigate cusp singularities in f(R) gravity, especially for Starobinsky and Hu-Sawicki dark energy models. We illustrate that, by using double-null numerical simulations, a cusp singularity can be triggered by gravitational collapses. This singularity can be cured by adding a quadratic term, but this causes a Ricci scalar bump that can be observed by an observer outside the event horizon. Comparing with cosmological parameters, it seems that it would be difficult to see super-Planckian effects by astrophysical experiments. On the other hand, at once there exists a cusp singularity, it can be a mechanism to realize a horizon scale curvature singularity that can be interpreted by a firewall.
Submission history
From: Dong-han Yeom [view email][v1] Mon, 22 Jun 2015 18:28:03 UTC (3,613 KB)
[v2] Tue, 13 Oct 2015 05:27:14 UTC (3,614 KB)
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